Scrap Defence - Gameplay Guide

A post-apocalyptic tower defense where you defend your scrap pile from waves of mutants on a procedurally generated open field. No fixed paths — you maze the enemies with your towers.

The Basics

You start with 200 scrap and a pile in the center of the map. Enemies spawn from the edges and path toward your pile. If they reach it, they steal scrap and flee. If your pile hits zero and there's no scrap left anywhere, it's game over.

The game alternates between two phases:

• Building — Place towers, plan your maze. Press Enter to start the next wave.
• Defending — Towers fire automatically. Survive until all enemies are dead and all dropped scrap is collected.

There are 20 waves of increasing difficulty.

Controls

Input	Action
1-5	Select tower type
Left Click	Place selected tower
Escape	Deselect tower
Enter	Start next wave (Building phase)
Scroll Wheel	Zoom in/out
Middle Mouse Drag	Pan camera
Home	Reset camera

Towers

Towers block enemy pathing (except Tar Pit), so placement is how you build your maze. You must always leave at least one path from every map edge to your pile.

#	Tower	Cost	Damage	Range	Fire Rate	Special
1	Scrap Gun	50	10	80	1.0s	Reliable all-rounder
2	Tar Pit	75	2	70	Aura	Slow 40% — enemies walk through
3	Explosive	125	25	100	3.3s	AOE — 70-unit blast radius
4	Railgun	150	50	160	5.0s	Long range sniper
5	Scrap Magnet	100	0	90	Aura	Pulls enemies + slows 50%

Tar Pit is unique — it doesn't block pathing, so you can place it directly on enemy routes.

Scrap Magnet deals no damage but pulls enemies toward it and has the widest scrap collection range (90 units vs 30 for other towers).

All towers automatically collect nearby scrap drops.

Enemies

Type	HP	Speed	Loot	Appears
Shambler	50	40	10	Wave 1+
Runner	30	80	15	Wave 3+
Brute	150	25	30	Wave 6+

Enemies get tougher each wave: +15% HP and +5% speed per wave. Spawn rate also increases — starting at 1.5s between spawns, dropping to 0.3s by late waves.

When killed, enemies drop scrap on the ground. Drops last 10 seconds (they blink before expiring), so tower placement near kill zones matters for collection.

If an enemy reaches your pile, it grabs scrap and runs for the nearest edge. Kill it before it escapes or that scrap is gone for good.

Economy Tips

• Killing enemies is your only income — don't let drops expire.
• Tower scrap collection auras pull nearby drops automatically.
• Scrap Magnets have 3x the collection range of other towers — great near kill zones.
• Your pile shrinks visually as scrap decreases. If it empties, you lose.
• Enemies that escape with stolen scrap permanently reduce your total economy.

Map

The grid is procedurally generated each game with obstacle clusters (rubble/ruins) covering ~8% of the field. These block both placement and pathing, creating natural chokepoints to build around.